Which ancient civilization developed the qanat system, an early sustainable water management technology that minimized evaporation and is still in use today in parts of the Middle East and North Africa?

Long before modern environmental concerns, ancient civilizations designed products and structures with remarkable sustainability principles. Their innovations often utilized local materials, passive climate control, and designs that lasted millennia rather than decades. This poll explores how ancient product designers approached sustainability in ways that modern manufacturers are only now rediscovering.

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Ancient Persians (modern-day Iran)
Ancient Egyptians
Mayans
Ancient Romans